pinot

It is possible to use AN as a pure oxidizer. As an ingredient of the oxidizer as well. I have done several tests where pure AN or mixtures AN/AP or AN/KP or AN/AP/KP were used.

For the pure AN propellant U have to use a catalyzer of decomposition....usually chromate (ammonium bichromate is the best choice). Then U can even mix AN and polyurethane to get some propellant. Its Kn is very high (600-700) but it works.
The common information avaliable everywhere in the internet that a simple mixture of 85%AN and 15% PUR can be used in amateur motor is a bulls**t...(or it has to burn at 3000 psi to achieve a reasonable rate)
I agree that dealing with AN is a pure s**t - drying, need of working quickly, protecting the nozzle against humidity etc. The phase transition of AN at +/-35 deg C is not so bad if 4% of KNO3 (phase stabilizer) and elastic binder is added. Advantage is really low cost

Another way to make a solid propellant is to combine AN and Mg powder which work well together. Wickmann has been producing quite good fuels by combining AN/Mg/HTPB. I made a similar propellant based on a neutral silicone (instead of HTPB), Al-Mg (magnalite powder) and AN + additives. It is much more difficult in production, the performance is not perfect but it works...

For some more data look here: www.pinot.webpark.pl - once again sorry for my English ( I still polish it ) - remarks welcomed